Benchmarking `_.each` vs. For Loop

.gitignore

node_modules/

README.md

Benchmarking _.each vs. For Loop

Running the microbenchmark produces

$ npm run benchmark

> @ benchmark .../lodash-each-microbenchmark
> node index.js

withForLoop x 2,291,112 ops/sec ±1.78% (87 runs sampled)
withLodash x 732,795 ops/sec ±1.34% (85 runs sampled)

The comparison is between just a vanilla for loop

for (const value of VALUES) {
  result.push(value * value);
}

and using _.each

_.each(VALUES, value => {
  result.push(value * value);
});

See also a jsPerf with a similar test.

index.js

const Benchmark = require("benchmark");
const _ = require("lodash");

const VALUES = [
  46,
  -4,
  17,
  -49,
  -20,
  -23,
  4,
  41,
  25,
  50,
  -42,
  -49,
  -30,
  -18,
  -7,
  -39,
  43,
  -27,
  48,
  -32,
  44,
  33,
  -28,
  46,
  -25,
  4,
  23,
  -40,
  -24,
  -5,
  46,
  45,
  36,
  -44,
  38,
  -24,
  29,
  -32,
  35,
  40,
  -24,
  27,
  -25,
  6,
  1,
  39,
  -33,
  8,
  30,
  -15,
  -35,
  15,
  45,
  -24,
  48,
  23,
  -37,
  1,
  -24,
  41,
  7,
  28,
  23,
  15,
  13,
  18,
  -42,
  37,
  7,
  28,
  -25,
  31,
  -48,
  -47,
  -9,
  42,
  -32,
  -20,
  -45,
  47,
  17,
  -41,
  21,
  -16,
  -40,
  -24,
  -16,
  22,
  -1,
  27,
  16,
  18,
  39,
  3,
  -39,
  -1,
  -38,
  5,
  15,
  3,
];

function withForLoop() {
  const result = [];
  for (const value of VALUES) {
    result.push(value * value);
  }
  return result.length === VALUES.length;
}

function withLodash() {
  const result = [];
  _.each(VALUES, value => {
    result.push(value * value);
  });
  return result.length === VALUES.length;
}

function main() {
  const suite = new Benchmark.Suite();
  suite
    .add("withForLoop", withForLoop)
    .add("withLodash", withLodash)
    .on("cycle", function(event) {
      console.log(String(event.target));
    })
    .run({ async: true });
}

if (require.main === module) {
  main();
}

package-lock.json

{
  "requires": true,
  "lockfileVersion": 1,
  "dependencies": {
    "benchmark": {
      "version": "2.1.4",
      "resolved": "https://registry.npmjs.org/benchmark/-/benchmark-2.1.4.tgz",
      "integrity": "sha1-CfPeMckWQl1JjMLuVloOvzwqVik=",
      "requires": {
        "lodash": "^4.17.4",
        "platform": "^1.3.3"
      }
    },
    "lodash": {
      "version": "4.17.15",
      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
      "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A=="
    },
    "platform": {
      "version": "1.3.5",
      "resolved": "https://registry.npmjs.org/platform/-/platform-1.3.5.tgz",
      "integrity": "sha512-TuvHS8AOIZNAlE77WUDiR4rySV/VMptyMfcfeoMgs4P8apaZM3JrnbzBiixKUv+XR6i+BXrQh8WAnjaSPFO65Q=="
    },
    "prettier": {
      "version": "1.18.2",
      "resolved": "https://registry.npmjs.org/prettier/-/prettier-1.18.2.tgz",
      "integrity": "sha512-OeHeMc0JhFE9idD4ZdtNibzY0+TPHSpSSb9h8FqtP+YnoZZ1sl8Vc9b1sasjfymH3SonAF4QcA2+mzHPhMvIiw=="
    }
  }
}

package.json

{
  "scripts": {
    "benchmark": "node index.js",
    "prettier": "prettier index.js --write"
  },
  "prettier": {
    "parser": "typescript",
    "printWidth": 120,
    "quoteProps": "consistent",
    "semi": true,
    "singleQuote": false,
    "trailingComma": "all"
  },
  "dependencies": {
    "benchmark": "2.1.4",
    "lodash": "4.17.15",
    "prettier": "1.18.2"
  }
}